## Introduction to Multisim

Multisim is a software tool to simulate and capture your electronics design. In this lab we use the circuits that we worked with in previous labs to learn the basics of Multisim. There are two or sometimes three different versions of Multisim installed on lab computers. They are Multisim 2001, Multisim 2001 Textbook Edition and Multisim 7. For this session we use Multisim 7. I will cover how to use the software in class.

First you are to use the following circuits to measure the resistances with the built-in multimeter. The resistor values are as follow: R1=100 Ohm, R2=200 Ohm and R3=300 Ohm. Remember not to forget adding a ground node any time you use Multisim.

Figure 1 - Series Resistors

Figure 2 - Parallel Resistors

The next step is to add the battery to both circuits and the extra resistor (100 Ohm) to the parallel combo:

Figure 3 - Series Resistors with Power Supply

Figure 4 - Parallel Resistors with Power Supply

In above cases you use the multimeter to find the voltages at different nodes.

The next step is to put the low-pass and high-pass filters together in Multisim and use the built-in function generator to create your input signal and oscope to make measurement of your output signal. The value for the resistor is 10k Ohm and that of the capacitor 10nF. The circuits are the following:

Figure 5 - Low-Pass Filter

Figure 6 - High-Pass Filter

Again you will use a table similar to the one you used previously to enter your data. Then you use Microsoft Excel to plot the responses of both filters. You are required to turn in all your files by email to me by the end of class.

 Frequency (Hz) LP Magnitude (V) HP Magnitude (V) 20 30 40 50 60 70 80 90 100 200 300 400 500 1000 2000 3000 4000 5000 10000 11000 12000 13000 14000 15000 20000

Table 1 - Low-Pass and High-Pass Filters Data